Study On The Furfuryl Alcohol Condensate To Long Chain Alkanes By Hydrodeoxygenation Process

In this paper, preparation of long chain alkanes over chemical catalysis method with furfuryl alcohol condensate as raw materials. Primarily conversion of furfuryl alcohol condensate into hydrogenated products with Raney Nickel catalysis, and then hydrodeoxygenation of hydrogenated product into long chain alkanes with bi-functional catalysis. The conclusions are as follows:(1)The study of conversion of furfuryl alcohol condensate into hydrogenated products,The effect of reaction temperature, time and catalyst content on hydrogenated products are investigated by orthogonal experiment. It is showed that the reaction temperature is the significance factor. On one hand, the cracked extent of C-C bond is investigated at different temperature characterized by GC-MS and GPC. It is shown that the cracked extent of C-C bond increase with temperature. For the other hand, the impact of reaction temperature on furfuryl alcohol condensate hydrotreating effect are characterized by FT-IR and elemental analysis. It is shown that the furfuryl alcohol condensate can be well hydrotreated at 130℃ or 150℃. The ratio of H/C is increased with temperature which is further verified the result of GPC, as the cracked of C-C bond is the hydrogenation process.(2) The study of conversion of hydrogenated products into long chain alkanes,A series of bi-functional catalysts were prepared with an incipient wetness impregnation method for hydrodeoxygenation of hydrogenated products to long chain alkanes. Among these catalysts, Pd/H-ZSM-5 showed the highest catalytic activity. The alkanes are characterized by GC-MS and GC based on standard sample. The high boiling component are characterized by TG-DTA, FT-IR, MS, elemental analysis, simulated distillation. The impact of different reaction solvents on hydrodeoxygenation process are investigated. It is shown thathydrogenated products would be etherized with methanol in the condition of acid support catalytic, as a result of oxygen groups are protected. Besides, the alkane carbon yield in the water solvent is obvious inferior to the octane solvent. The temperature of hydrodeoxygenation process should be controlled under 170℃, because excessive reaction temperature would induce the crack of alkane C-C bond. The carbon yield of alkane reached 39.1% at 170 °C for 5 h over 5wt% Pd/H-ZSM-5, and the ratio of deoxidation of the high-boiling component reached 97.38%. The carbon yield of alkane decreased significantly with the recovered catalyst.By the analysis resultof fresh and used catalysts characterized by XRD, NH3-TPD, and SEM, demonstrated that the reason may be the decreased acid amount and the formation of coke on the surface of the catalysts.